數學題.........

1.

4/5 x 0.25 x (1 - 50%)
= 4/5 x 1/4 x 1/2

= 4 x 1 x 1
______________

5 x 4 x 2


= 4
_______

40

= 1 / 10 or 0.1

2.

2/3 x 1.8 ÷ (1 + 20% )

= 2/ 3 x 18 / 10 ÷ 120%

= 2/3 x 18/10 x 100/120

= 2x18 x 100
_____________

3 x 10 x 120

= 360
_____

3600

= 1 / 10 or 0.1

2006-10-26 21:11:26 補充：
this one sin arm2.2/3 x 1.8 ÷ (1 20% )= 2/ 3 x 18 / 10 ÷ 120%= 2/3 x 18/10 x 100/120= 2x18 x 100_____________3 x 10 x 120= 3600 _____ 3600= 1

1. 0.1
2. 1

2006-10-26 21:08:47 補充：
2. 5/72..咁錯計數機添,,

1.
4 / 5 x 0. 25 x ( 1 - 50%)
= 0.8 x 0.25 x 0.5
= 0.2 x 0.5
= 0.1

2.
2 / 3 X 1 . 8 ÷ ( 1 + 2 0 % )
= 2 / 3 x 1 / 8 x 5 / 6
= 10 / 144
= 5 / 72